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Lightweight ceramisite prepared from coal ashes and gasification slag as well as preparation method and application thereof

A technology of lightweight ceramsite and fly ash, which is applied in the field of building materials, can solve the problems of density, strength, water absorption and other quality indicators that need to be improved, limited raw material sources, and high energy consumption in production, so as to achieve good environmental protection benefits and good economics. Benefits, the effect of high carbon content

Active Publication Date: 2015-07-15
北京大学包头创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: although there are many methods for preparing ceramsite reported in the literature, the ubiquitous problems include: a, limited source of raw materials, high cost; b, high firing temperature, high production energy consumption; c , density, strength, water absorption and other quality indicators still need to be improved

Method used

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  • Lightweight ceramisite prepared from coal ashes and gasification slag as well as preparation method and application thereof
  • Lightweight ceramisite prepared from coal ashes and gasification slag as well as preparation method and application thereof
  • Lightweight ceramisite prepared from coal ashes and gasification slag as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The preparation of lightweight ceramsite with fly ash and gasification slag comprises the following steps:

[0071] a. Pretreatment: Dry the fly ash and gasification slag raw materials in a blast drying oven at 100°C, conduct appropriate ball milling on the dried fly ash and gasification slag raw materials, and then pass the fly ash and gasification slag raw materials through 100 Mesh sieve (standard sieve made by Taylor), the sieve residue is less than 5%, packaged for use; other raw materials pass through 200 mesh sieves, packaged for use;

[0072] B. Mixing of ingredients: composition according to weight percentage: base material: 50% of fly ash, 30% of gasification slag, 14% of potassium feldspar, 6% of albite feldspar, additive: 1% of silicon carbide (additional, silicon carbide quality account for 1% of the base material) to weigh, the total mass of the base material is 50g, and the fly ash, gasification slag, potassium feldspar, albite feldspar, and silicon carbi...

Embodiment 2

[0094] Utilize fly ash and gasification slag to prepare lightweight ceramsite, comprise the following steps:

[0095] a. Pretreatment: Dry the fly ash and gasification slag raw materials in a blast drying oven at 100°C, conduct appropriate ball milling on the dried fly ash and gasification slag raw materials, and then pass the fly ash and gasification slag raw materials through 100 Mesh sieve, the sieve residue is less than 5%, packaged for use;

[0096] b, batching mixing: composition according to weight percentage: base material: fly ash 60%, gasification slag 10%, potassium feldspar 20%, albite 10%, auxiliary agent: silicon carbide 0.8% (extra, silicon carbide quality account for 0.8% of the base material) to weigh, the total mass of the base material is 50g, and the fly ash, gasification slag, potassium feldspar, albite feldspar, and silicon carbide are evenly mixed together;

[0097] c. Forming: add appropriate amount of water to the mixed raw materials, and automaticall...

Embodiment 3

[0105] The preparation of lightweight ceramsite by using fly ash and gasification slag comprises the following steps:

[0106] a. Pretreatment: Dry the fly ash and gasification slag raw materials in a blast drying oven at 100°C, conduct appropriate ball milling on the dried fly ash and gasification slag raw materials, and then pass the fly ash and gasification slag raw materials through 100 Mesh sieve, the sieve residue is less than 5%, packaged for use;

[0107] B. Mixing of ingredients: composition according to weight percentage: base material: fly ash 78%, gasification slag 10%, potassium feldspar 8%, albite 4%, additive: silicon carbide 0.5% (additional, silicon carbide quality account for 0.5% of the base material), semi-coke 1% (additional, the semi-coke quality accounts for 1% of the base material), the total mass of the base material is 50g, weigh the material, and fly ash, gasification slag, potassium feldspar, Sodium feldspar and silicon carbide are evenly mixed tog...

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Abstract

The invention relates to the technical field of building materials, and in particular relates to lightweight ceramisite prepared from coal ashes and gasification slag as well as a preparation method and an application thereof. The lightweight ceramisite is prepared from the following raw materials with the following components in parts by weight: 100 parts of base materials comprising 40-90 parts of coal ashes, 10-30 parts of gasification slag, 0-20 parts of potassium feldspar and 0-20 parts of albite; and 0-4 parts of additional auxiliaries which are selected from one or two of semicoke or silicon carbide, wherein the coal ashes account for 40-90%, and the gasification slag particles account for 10-30%; and the sintering temperature is 1120-1200 DEG C, the energy consumption is reduced, the raw material distribution is relatively wide and the raw materials are easily available. The lightweight ceramisite has bulk density lower than or equal to 700 kg / m<3>, is smaller in weight, higher in strength, wider in raw material distribution and easier to obtain, and the barrel pressure strength can be higher than 10 MPa.

Description

technical field [0001] The invention relates to the technical field of building materials, and mainly relates to a lightweight ceramsite with low density, high strength, smooth surface and low water absorption, in particular to a lightweight ceramsite prepared by using fly ash and gasification slag and its preparation. law and application. Background technique [0002] Fly ash is a kind of solid waste produced in the production process of coal-fired power plants, and its output accounts for about 5-20% of the total amount of coal burned. The annual discharge of fly ash in my country is about 500 million tons. At present, the amount of fly ash stacked in my country is more than 2 billion tons, and the land occupied by the ash storage yard is about 4×10 4 km 2 , which not only seriously pollutes the environment, but also takes up a lot of land resources. Fly ash contains a large amount of silicon-aluminum oxides. If the main components in fly ash are utilized, it can "turn ...

Claims

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Application Information

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IPC IPC(8): C04B38/00B09B3/00
Inventor 方斌正曹建伟王习东李慧高小龙韩佳丽张娜
Owner 北京大学包头创新研究院
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